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21261 (1996 FF)
Classification: Inner Main-belt Asteroid          SPK-ID: 2021261
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08842536669014785 1.9426e-08  
a 1.943104662658832 5.1566e-09 au
q 1.771284920345888 3.7252e-08 au
i 20.62573868111302 5.9144e-07 deg
node 203.6057369982882 7.3109e-07 deg
peri 273.2902505250783 1.3256e-05 deg
M 129.963098585498 1.4686e-05 deg
tp 2458843.342088925481
(2019-Dec-25.84208893)
4.0026e-05 TDB
period 989.3335060970473
2.71
3.9382e-06
1.078e-08
d
yr
n .3638813380739642 1.4485e-09 deg/d
Q 2.114924404971775 5.6125e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1458  
   data-arc span      10264 days (28.10 yr)  
   first obs. used      1993-01-31  
   last obs. used      2021-03-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43392  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:42:26  

Additional Information
 Earth MOID = .876632 au 
 Jupiter MOID = 2.99177 au 
 T_jup = 3.817 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.66   n/a E2021B10  
rotation period rot_per 3.260 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Warner, B.D. (2015) Minor Planet Bull. 42, 267-276.]

21261 (1996 FF)          Discovered 1996-Mar-16 by JPL/GEODSS NEAT at Haleakala
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1996 FF = 1985 FG3 = 1993 HE8 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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